/Engine/Plugins/Online/OnlineServices/Source/OnlineServicesCommon/Public/Online/AuthCommon.h
Triggered when the auth token will expire soon. Services which allow login using an external auth token may trigger this notification when an updated external auth token is required to maintain the auth session without interruption.
virtual [TOnlineEvent](API\Plugins\OnlineServicesInterface\Online\TOnlineEvent)< void(const [FAuthPendingAuthExpiration](API\Plugins\OnlineServicesInterface\Online\FAuthPendingAuthExpiration) &)> OnPendingAuthExpiration()